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3 SCC GENERAL INFORMATION
The Serial Communications Controller (SCC) is a dual channel, multi-protocol
data communications peripheral. The MPA-200 provides a single channel for
communications, however, to provide full DMA capabilities, both channels of the
SCC can be utilized. The SCC can be software configured to satisfy a wide
variety of serial communications applications. Some of its protocol capabilities
include:
1) Asynchronous Communications
5, 6, 7, or 8 bits per character
1, 1-1/2, or 2 stop bits
Odd, even, or no parity
Times 1, 16, 32, or 64 clock modes
Break generation and detection
Parity, overrun and framing error detection
2) Byte-oriented Synchronous Communications
Internal/external character synchronization
1 or 2 sync characters in separate registers
Automatic Cyclic Redundancy Check (CRC) generation/detection
3) SDLC/HDLC (Bit Synchronous) Communications
Abort sequence generation and checking
Automatic zero insertion and deletion
Automatic flag insertion between messages
Address field recognition
I-field residue handling
CRC generation and detection
SDLC loop mode with EOP recognition/loop entry and exit
4) NRZ, NRZI, or FM encoding/decoding
5 Quatech Inc., MPA-200/300 Manual